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Research Article

Chemical synthesis and coercivity enhancement of Nd2Fe14B nanostructures mediated by non-magnetic layer

Kai Zhu1,2, Junjie Xu1, Xiaobai Wang1, Wei Li1, Kesong Tian1, Yanglong Hou1,2( )
Beijing Key Laboratory for Magnetoelectric Materials and Devices (BKLMMD), Beijing Innovation Centre for Engineering Science and Advanced Technology, Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
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Abstract

High-performance Nd2Fe14B magnets have been widely required in various fields recently due to the lightweight and miniaturization of devices. In this work, we synthesize Nd2Fe14B nanostructures with tunable magnetic properties through surfactant-assisted high energy ball milling (SAHEBM) process, achieving prominently enhanced coercivity by forming non-magnetic layers as grain boundary phase. When the reduction annealing process was carried out as pellet with Ca, the coercivity increased from 0.8 kOe to over 3 kOe as Nd2Fe14B powder, which is proved to be the contribution of the chemical diffusion of Nd elements and the formation of Nd-rich layer as magnetic insulating medium. In addition, two-dimensional graphene oxide (GO) was employed to build extra grain boundary, by which the coercivity of the core@dual-shell structure can achieve up to 8 kOe, tenfold of the original sample. The intrinsic mechanism indicated that the Nd-diffusion induced Nd-rich phase along with the reduced GO in the system could form non-magnetic layer as grain boundary and magnetically isolate the adjacent grains, significantly enhancing the exchange coupling effect. This work markedly opens up an effective approach for the chemical preparation of high-performance Nd2Fe14B nanostructured magnets, especially after post treatment, and gives an insight on the interactions at nanoscale.

Keywords

Nd2Fe14B nanostructureschemical reductiondiffusion processgrain boundarygraphene oxidecoercivity enchantment

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References

[1]
Hou, Y. L.; Sellmyer, D. J. Magnetic nanomaterials: Fundamentals, synthesis and applications; Wiley: New York, 2017.
Crossref
[2]
Sagawa, M.; Fujimura, S.; Togawa, N.; Yamamoto, H.; Matsuura, Y. New material for permanent magnets on a base of Nd and Fe (invited). J. Appl. Phys. 1984, 55, 2083-2087.
Crossref Google Scholar
[3]
Chen, F. G.; Zhang, T. Q.; Zhang, W. H.; Zhang, L. T.; Jin, Y. X. Dependence of the demagnetization behavior on the direction of grain boundary diffusion in sintered Nd-Fe-B magnets. J. Magn. Magn. Mater. 2018, 465, 392-398.
Crossref Google Scholar
[4]
Zeng, H. X.; Liu, Z. W.; Li, W.; Zhang, J. S.; Zhao, Z.; Zhong, X. C.; Yu, H. Y.; Guo, B. C. Significantly enhancing the coercivity of NdFeB magnets by ternary Pr-Al-Cu alloys diffusion and understanding the elements diffusion behavior. J. Magn. Magn. Mater. 2019, 471, 97-104.
Crossref Google Scholar
[5]
Gutfleisch, O.; Willard, M. A.; Brück, E.; Chen, C. H.; Sankar, S. G.; Liu, J. P. Magnetic materials and devices for the 21st century: Stronger, lighter, and more energy efficient. Adv. Mater. 2011, 23, 821-842.
Crossref Google Scholar
[6]
Yue, M.; Zhang, X. Y.; Liu, J. P. Fabrication of bulk nanostructured permanent magnets with high energy density: Challenges and approaches. Nanoscale 2017, 9, 3674-3697.
Crossref Google Scholar
[7]
Skokov, K. P.; Gutfleisch, O. Heavy rare earth free, free rare earth and rare earth free magnets - Vision and reality. Scripta Mater. 2018, 154, 289-294.
Crossref Google Scholar
[8]
Cui, J.; Kramer, M.; Zhou, L.; Liu, F.; Gabay, A.; Hadjipanayis, G.; Balasubramanian, B.; Sellmyer, D. Current progress and future challenges in rare-earth-free permanent magnets. Acta Mater. 2018, 158, 118-137.
Crossref Google Scholar
[9]
Pathak, A. K.; Khan, M.; Gschneidner, K. A., Jr.; McCallum, R. W.; Zhou, L.; Sun, K. W.; Dennis, K. W.; Zhou, C.; Pinkerton, F. E.; Kramer, M. J. et al. Cerium: An unlikely replacement of dysprosium in high performance Nd-Fe-B permanent magnets. Adv. Mater. 2015, 27, 2663-2667.
Crossref Google Scholar
[10]
Jiang, Q. Z.; Zhong, Z. C. Research and development of Ce-containing Nd2Fe14B-type alloys and permanent magnetic materials. J. Mater. Sci. Technol. 2017, 33, 1087-1096.
Crossref Google Scholar
[11]
Qiao, S.; Yang, Z. Y.; Xu, J. J.; Wang, X. B.; Yang, J. B.; Hou, Y. L. Chemical synthesis, structure and magnetic properties of Co nanorods decorated with Fe3O4 nanoparticles. Sci. China Mater. 2018, 61, 1614-1622.
Google Scholar
[12]
Wang, C. H.; Levin, A. A.; Karel, J.; Fabbrici, S.; Qian, J. F.; ViolBarbosa, C. E.; Ouardi, S.; Albertini, F.; Schnelle, W.; Rohlicek, J. et al. Size-dependent structural and magnetic properties of chemically synthesized Co-Ni-Ga nanoparticles. Nano Res. 2017, 10, 3421-3433.
Google Scholar
[13]
Qiao, M. T.; Lei, X. F.; Ma, Y.; Tian, L. D.; He, X. W.; Su, K. H.; Zhang, Q. Y. Application of yolk-shell Fe3O4@N-doped carbon nanochains as highly effective microwave-absorption material. Nano Res. 2018, 11, 1500-1519.
Google Scholar
[14]
Lei, W. J.; Yu, Y. S.; Yang, W. W.; Feng, M.; Li, H. B. A general strategy for synthesizing high-coercivity L10-FePt nanoparticles. Nanoscale 2017, 9, 12855-12861.
Google Scholar
[15]
Yang, W. W.; Lei, W. J.; Yu, Y. S.; Zhu, W. L.; George, T. A.; Li, X. Z.; Sellmyer, D. J.; Sun, S. H. From FePt-Fe3O4 to L10-FePt-Fe nanocomposite magnets with a gradient interface. J. Mater. Chem. C 2015, 3, 7075-7080.
Google Scholar
[16]
Lei, W. J.; Xu, J. J.; Yu, Y. S.; Yang, W. W.; Hou, Y. L.; Chen, D. F. Halide ion-mediated synthesis of L10-FePt nanoparticles with tunable magnetic properties. Nano Lett. 2018, 18, 7839-7844.
Google Scholar
[17]
Lei, W. J.; Yu, Y. S.; Yang, W. W. Cu induced low temperature ordering of fct-FePtCu nanoparticles prepared by solution phase synthesis. J. Mater. Chem. C 2019, 7, 11632-11638.
Google Scholar
[18]
Liu, F.; Zhu, J. H.; Yang, W. L.; Dong, Y. H.; Hou, Y. L.; Zhang, C. Z.; Yin, H.; Sun, S. H. Building nanocomposite magnets by coating a hard magnetic core with a soft magnetic shell. Angew. Chem., Int. Ed. 2014, 53, 2176-2180.
Google Scholar
[19]
Liu, F.; Hou, Y. L.; Gao, S. Exchange-coupled nanocomposites: Chemical synthesis, characterization and applications. Chem. Soc. Rev. 2014, 43, 8098-8113.
Google Scholar
[20]
Han, G. H.; Liu, Y. Q.; Yang, W. W.; Geng, S.; Cui, W. B.; Yu, Y. S. Fabrication, characterization, and magnetic properties of exchange-coupled porous BaFe8Al4O19/Co0.6Zn0.4Fe2O4 nanocomposite magnets. Nanoscale 2019, 11, 10629-10635.
Google Scholar
[21]
Hou, Y.; Xu, Z.; Peng, S.; Rong, C.; Liu, J. P.; Sun, S. A facile synthesis of SmCo5 magnets from Core/Shell Co/Sm2O3 nanoparticles. Adv. Mater. 2007, 19, 3349-3552.
Google Scholar
[22]
Hou, Y. L.; Sun, S. H.; Rong, C. B.; Liu, J. P. SmCo5/Fe nanocomposites synthesized from reductive annealing of oxide nanoparticles. Appl. Phys. Lett. 2007, 91, 153117.
Google Scholar
[23]
Yang, C.; Hou, Y. L. Advance in the chemical synthesis and magnetic properties of nanostructured rare-earth-based permanent magnets. Rare Metals 2013, 32, 105-112.
Google Scholar
[24]
Yu, L. Q.; Yang, C.; Hou, Y. L. Controllable Nd2Fe14B/α-Fe nanocomposites: Chemical synthesis and magnetic properties. Nanoscale 2014, 6, 10638-10642.
Google Scholar
[25]
Yu, L. Q.; Zhang, Y. P.; Yang, Z.; He, J. D.; Dong, K. T.; Hou, Y. Chemical synthesis of Nd2Fe14B/Fe3B nanocomposites. Nanoscale 2016, 8, 12879-12882.
Google Scholar
[26]
Zhu, K.; Ju, Y. M.; Xu, J. J.; Yang, Z. Y.; Gao, S.; Hou, Y. L. Magnetic nanomaterials: Chemical design, synthesis, and potential applications. Acc. Chem. Res. 2018, 51, 404-413.
Google Scholar
[27]
Deheri, P. K.; Swaminathan, V.; Bhame, S. D.; Liu, Z. W.; Ramanujan, R. V. Sol-gel based chemical synthesis of Nd2Fe14B hard magnetic nanoparticles. Chem. Mater. 2010, 22, 6509-6517.
Google Scholar
[28]
Jeong, J. H.; Ma, H. X.; Kim, D.; Kim, C. W.; Kim, I. H.; Ahn, J. W.; Kim, D. S.; Kang, Y. S. Chemical synthesis of Nd2Fe14B hard phase magnetic nanoparticles with an enhanced coercivity value: Effect of CaH2 amount on the magnetic properties. New J. Chem. 2016, 40, 10181-10186.
Google Scholar
[29]
Jadhav, A. P.; Hussain, A.; Lee, J. H.; Baek, Y. K.; Choi, C. J.; Kang, Y. S. One pot synthesis of hard phase Nd2Fe14B nanoparticles and Nd2Fe14B/α-Fe nanocomposite magnetic materials. New J. Chem. 2012, 36, 2405-2411.
Google Scholar
[30]
Rahimi, H.; Ghasemi, A.; Mozaffarinia, R. Controlling of saturation of magnetization of Nd-Fe-B nanoparticles fabricated by chemical method. J. Supercond. Nov. Magn. 2017, 30, 475-481.
Google Scholar
[31]
Pal, A.; Gabay, A.; Hadjipanayis, G. C. Mechanochemical synthesis of Nd2Fe14B alloy with high coercivity. J. Alloys Compd. 2012, 543, 31-33.
Google Scholar
[32]
Rahimi, H.; Ghasemi, A.; Mozaffarinia, R.; Tavoosi, M. Coercivity enhancement mechanism in Dy-substituted Nd-Fe-B nanoparticles synthesized by sol-gel base method followed by a reduction-diffusion process. J. Magn. Magn. Mater. 2017, 429, 182-191.
Google Scholar
[33]
Xia, M.; Abrahamsen, A. B.; Bahl, C. R. H.; Veluri, B.; Soegaard, A. I.; Bojsoe, P.; Millot, S. The influence of carbon and oxygen on the magnetic characteristics of press-less sintered NdFeB magnets. J. Magn. Magn. Mater. 2017, 422, 232-236.
Google Scholar
[34]
Sepehri-Amin, H.; Ohkubo, T.; Shima, T.; Hono, K. Grain boundary and interface chemistry of an Nd-Fe-B-based sintered magnet. Acta Mater. 2012, 60, 819-830.
Google Scholar
[35]
Song, T. T.; Tang, X.; Yin, W. Z.; Ju, J. Y.; Wang, Z. X.; Liu, Q. B.; Tang, Y.; Chen, R. J.; Yan, A. R. Magnetic properties improvement of hot-deformed Nd-Fe-B permanent magnets by Pr-Cu eutectic pre-diffusion process. Acta Mater. 2019, 174, 332-341.
Google Scholar
[36]
Sawatzki, S.; Kübel, C.; Ener, S.; Gutfleisch, O. Grain boundary diffusion in nanocrystalline Nd-Fe-B permanent magnets with low-melting eutectics. Acta Mater. 2016, 115, 354-363.
Google Scholar
[37]
Ma, T.; Wu, B.; Zhang, Y.; Jin, J.; Wu, K.; Tao, S.; Xia, W.; Yan, M. Enhanced coercivity of Nd-Ce-Fe-B sintered magnets by adding (Nd, Pr)-H powders. J. Alloys Compd. 2017, 721, 1-7.
Google Scholar
[38]
Zhang, L. L.; Li, Z. B.; Ma, Q.; Li, Y. F.; Zhao, Q.; Zhang, X. F. Coercivity enhancement in (Ce,Nd)-Fe-B sintered magnets prepared by adding NdHx powders. J. Magn. Magn. Mater. 2017, 435, 96-99.
Google Scholar
[39]
Zhang, C. Z.; Hao, R.; Liao, H. B.; Hou, Y. L. Synthesis of amino-functionalized graphene as metal-free catalyst and exploration of the roles of various nitrogen states in oxygen reduction reaction. Nano Energy 2013, 2, 88-97.
Google Scholar
[40]
Yang, C.; Jia, L. H.; Wang, S. G.; Gao, C.; Shi, D. W.; Hou, Y. L.; Gao, S. Single domain SmCo5@Co exchange-coupled magnets prepared from core/shell Sm[Co(CN)6]·4H2O@GO particles: A novel chemical approach. Sci. Rep. 2013, 3, 3542.
Google Scholar
[41]
Zhang, Y. L.; Wang, X. X.; Cao, M. S. Confinedly implanted NiFe2O4-rGO: Cluster tailoring and highly tunable electromagnetic properties for selective-frequency microwave absorption. Nano Res. 2018, 11, 1426-1436.
Google Scholar
[42]
Sun, G. B.; Wu, H.; Liao, Q. L.; Zhang, Y. Enhanced microwave absorption performance of highly dispersed CoNi nanostructures arrayed on graphene. Nano Res. 2018, 11, 2689-2704.
Google Scholar
[43]
Kelly, P. E.; O’Grady, K.; Mayo, P. I.; Chantrell, R. W. Switching mechanisms in cobalt-phosphorus thin films. IEEE Trans. Magn. 1989, 25, 3881-3883.
Google Scholar
[44]
Liu, D.; Ma, T. Y.; Wang, L. C.; Liu, Y. L.; Zhao, T. Y.; Hu, F. X.; Sun, J. R.; Shen, B. G. Computational analysis of microstructure-coercivity relation in multi-main-phase Nd-Ce-Fe-B magnets. J. Phys. D: Appl. Phys. 2019, 52, 135002.
Google Scholar
[45]
Tang, X.; Chen, R. J.; Yin, W. Z.; Jin, C. X.; Lee, D.; Yan, A. The magnetization behavior and open recoil loops of hot-deformed Nd-Fe-B magnets infiltrated by low melting point PrNd-Cu alloys. Appl. Phys. Lett. 2015, 107, 202403.
Google Scholar
[46]
Wang, Z. X.; Yin, W. Z.; Wang, J. Z.; Jin, C. X.; Chen, R. J.; Ju, J. Y.; Tang, X.; Lee, D.; Yan, A. R. Hot-deformed Nd-Fe-B magnet with macroscopic composite structure. Appl. Phys. Lett. 2017, 111, 182407.
Google Scholar
[47]
Yang, J. B.; Han, J. Z.; Tian, H. D.; Zha, L.; Zhang, X. Z.; Song Kim, C.; Liang, D.; Yang, W. Y.; Liu, S. Q.; Wang, C. S. Structural and magnetic properties of nanocomposite Nd-Fe-B prepared by rapid thermal processing. Engineering 2020, 6, 131-139.
Google Scholar
Nano Research
Volume 13 Issue 4,
April 2020
Pages 1141-1148
DOI: 10.1007/s12274-020-2761-5
Cite this article:
Zhu K, Xu J, Wang X, et al. Chemical synthesis and coercivity enhancement of Nd2Fe14B nanostructures mediated by non-magnetic layer. Nano Research, 2020, 13(4): 1141-1148. https://doi.org/10.1007/s12274-020-2761-5
Topics:
Ball millingGrain boundariesGrapheneIron compoundsMagnetic materials MagnetsNanomagnaticsNanostructures

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Received: 20 January 2020
Revised: 29 February 2020
Accepted: 15 March 2020
Published: 07 April 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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